A partial wave amplitude can be obtained by using the Jacob-Wick formula [1]}
\(\begin{aligned}&{\mathcal {M}}^{J L}(A\rightarrow BC) = \frac{\sqrt{4\pi (2 L+1)}}{2 J_A+1} \!\! \sum _{M_{J_B},M_{J_C}} \langle L 0 J M_{J_A}|J_A M_{J_A}\rangle \\& \hspace{28.45274pt}\times \langle J_B M_{J_B} J_C M_{J_C} | J M_{J_A} \rangle \mathcal {M}^{M_{J_A} M_{J_B} M_{J_C}}({\textbf {K}}),\end{aligned}\) 
